SLVAFL3 april 2023 BQ25890H
Figure 2-1 shows that when DCP is detected, the device initiates adjustable high voltage adapter handshake including MaxCharge™, and so on. The handshake connects combinations of one or more voltage sources and or current sink on D+/D- to signal input source to raise output voltage from 5 V to 9 V/12 V. The adjustable high voltage adapter handshake can be disabled by clearing MAXC_EN and or HVDCP_EN bits.
Also, we can get same conclusion from Figure 2-2, HVDCP/MaxCharge detection only happens after DCP/CDP detection, otherwise, it does not trigger HVDCP/MaxCharge detection, such as, if the result of BC1.2 detection is SDP, it cannot move forward to HVDCP/MaxCharge detection process.